Browsing by Author "Urdiales, Cristian"

Now showing 1 - 3 of 3
  • No Thumbnail Available
    Item
    Role of Organic Matter, Iron Oxides and Aluminosilicate Content on Physicochemical Interactions between Ciprofloxacin and Andisol Soil
    (Springer International Publishing AG, 2025) Urdiales, Cristian; Varas Gutiérrez, Mauricio Janssen; Suazo-Hernández, Jonathan; Pizarro, Carmen; Escudey, Mauricio; Caceres-Jensen, Lizethly; Antilen Lizana, Mónica Paulina
    Purpose The widespread use of antibiotics to treat infectious diseases in humans and animals has raised signifcant environmental concerns due to their presence in soils. The interaction between natural aluminosilicates such as allophane, both with and without iron oxides (FexOy) and organic matter (OM) coatings, in the adsorption of Ciprofoxacin (CIP) remains still unexplored. The objective of this study is to establish the role of diferent soil components, OM and FexOy, in the adsorption of CIP in soils. Methods Santa Bárbara (SB) series soil and chemically treated substrates without OM (SB1) and without OM and FexOy (SB2) were characterized. All CIP adsorption studies were conducted through batch experiments in an electrochemical cell, by using square wave voltammetry to determine CIP concentration. Results Adsorption isotherms revealed two types of adsorption sites in the SB soil: instantaneous and time dependent. The Langmuir-Freundlich model explained cooperative adsorption, while the Freundlich model aligned with SB1 and SB2 samples. SB1 showed higher adsorption capacity but lower intensity than SB2. The removal of OM and FexOy notably infuences the adsorption behavior, resulting in lower capacities than the original SB soil. Conclusions This study emphasizes the complex interaction between CIP and soil components. The adsorption data highlights the strong binding of CIP to soil particles and substrates, suggesting a low leaching potential. The calculated GUS index of 2.758 further supports this, indicating a moderate leaching potential and reinforcing the importance of understanding the strength of CIP binding in environmental matrices. This knowledge is crucial for assessing its mobility and developing strategies to minimize its environmental impact.
  • No Thumbnail Available
    Item
    Role of Organic Matter, Iron Oxides and Aluminosilicate Content on Physicochemical Interactions between Ciprofloxacin and Andisol Soil
    (HUMANA PRESS INC, 2025) Urdiales, Cristian; Varas Gutiérrez, Mauricio Janssen; Suazo-Hernández, Jonathan; Pizarro, Carmen; Escudey, Mauricio; Caceres-Jensen, Lizethly; Antilen Lizana, Mónica Paulina
    Purpose The widespread use of antibiotics to treat infectious diseases in humans and animals has raised signifcant environmental concerns due to their presence in soils. The interaction between natural aluminosilicates such as allophane, both with and without iron oxides (FexOy) and organic matter (OM) coatings, in the adsorption of Ciprofoxacin (CIP) remains still unexplored. The objective of this study is to establish the role of diferent soil components, OM and FexOy, in the adsorption of CIP in soils. Methods Santa Bárbara (SB) series soil and chemically treated substrates without OM (SB1) and without OM and FexOy (SB2) were characterized. All CIP adsorption studies were conducted through batch experiments in an electrochemical cell, by using square wave voltammetry to determine CIP concentration. Results Adsorption isotherms revealed two types of adsorption sites in the SB soil: instantaneous and time dependent. The Langmuir-Freundlich model explained cooperative adsorption, while the Freundlich model aligned with SB1 and SB2 samples. SB1 showed higher adsorption capacity but lower intensity than SB2. The removal of OM and FexOy notably infuences the adsorption behavior, resulting in lower capacities than the original SB soil. Conclusions This study emphasizes the complex interaction between CIP and soil components. The adsorption data highlights the strong binding of CIP to soil particles and substrates, suggesting a low leaching potential. The calculated GUS index of 2.758 further supports this, indicating a moderate leaching potential and reinforcing the importance of understanding the strength of CIP binding in environmental matrices. This knowledge is crucial for assessing its mobility and developing strategies to minimize its environmental impact.
  • No Thumbnail Available
    Item
    Transport mechanisms of the anthropogenic contaminant sulfamethoxazole in volcanic ash soils at equilibrium pH evaluated using the HYDRUS-1D model
    (2025) Urdiales, Cristian; Urdiales Flores, Diego; Tapia, Yasna; Cáceres Jensen, Lizethly; Simunek, Jirka; Antilén Lizana, Mónica Paulina
    The volcanic soils in Chile, where a significant portion of agricultural activities take place, are impacted by the presence of veterinary drugs, including sulfamethoxazole (SMX). The study examines how different soil types influence the movement and retention of sulfamethoxazole (SMX) across four regions of Chile, focusing on conditions at a neutral pH of 7.0. Collipulli's Ultisol soils (CLL), characterized by high clay and sand content but low organic matter (OM), promote low SMX adsorption and rapid transport. In contrast, the volcanic ash-derived Andisols from Frutillar (FRU), Nueva Braunau (NBR), and Osorno (OSR) have high OM and cation exchange capacity (CEC), which enhance their ability to retain SMX and reduce its mobility. Adsorption batch, kinetics, and column breakthrough curve (BTC) experiments were conducted alongside transport modelling. The adsorption kinetics of SMX in CLL soil followed a pseudo-first-order (PFO) model, while FRU, NBR, and OSR soils aligned with a pseudo-second-order (PSO) model. Freundlich isotherms effectively described SMX adsorption in CLL and OSR soils, indicating multilayer adsorption, while Langmuir isotherms fit the FRU and NBR soils, suggesting monolayer adsorption. Using HYDRUS-1D software, we simulated SMX transport in soil columns. BTCs were best modelled using a two-site sorption model with both equilibrium and kinetic adsorption. SMX was more mobile in CLL soil due to its lower organic matter (OM) content and adsorption capacity. In contrast, FRU, NBR, and OSR soils showed slower transport, reflecting higher OM content and greater adsorption capacity, reducing SMX leaching. These findings emphasize the importance of soil properties, such as OM content, in influencing SMX behavior, and are vital for assessing environmental impacts and developing mitigation strategies.